Make references to #includes consistent across docs

PiperOrigin-RevId: 554561504
Change-Id: Ia02ab6ac646bf6637d6f500a4aaedd14e0a04798

docs/reference/assertions.md

@@ -1,7 +1,7 @@
 # Assertions Reference
 
 This page lists the assertion macros provided by GoogleTest for verifying code
-behavior. To use them, include the header `gtest/gtest.h`.
+behavior. To use them, add `#include <gtest/gtest.h>`.
 
 The majority of the macros listed below come as a pair with an `EXPECT_` variant
 and an `ASSERT_` variant. Upon failure, `EXPECT_` macros generate nonfatal

docs/reference/mocking.md

@@ -1,8 +1,7 @@
 # Mocking Reference
 
 This page lists the facilities provided by GoogleTest for creating and working
-with mock objects. To use them, include the header
-`gmock/gmock.h`.
+with mock objects. To use them, add `#include <gmock/gmock.h>`.
 
 ## Macros {#macros}
 

docs/reference/testing.md

@@ -3,7 +3,7 @@
 <!--* toc_depth: 3 *-->
 
 This page lists the facilities provided by GoogleTest for writing test programs.
-To use them, include the header `gtest/gtest.h`.
+To use them, add `#include <gtest/gtest.h>`.
 
 ## Macros